4 layers195 × 140 mm
2 layers85.3 × 29.6 mm
Voltage Blaster
chadr/Enhanced-Voltage-BlasterAn enhanced version of the Voltage Blaster
- Size
- 85.3 × 29.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 66
- Pads
- 95
- Tracks, vias
- 109, 16
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 25 Oct 2023
- Updated
- 26 Aug 2024
Overview
Voltage Blaster is an open-source printed circuit board by chadr, from the chadr/Enhanced-Voltage-Blaster repository on GitHub, published under the MIT licence. It is a 2-layer board of 85.3 × 29.6 mm with 16 parts on 66 nets, routed with 109 tracks and 16 vias.
It is built around the MC79M05BT and SB140. Its parts include 6 diodes, 4 resistors, 2 capacitors, 1 IC and 1 connector.
Main components
2
MC79M05BT
TO-220AB-40℃~+125℃ 1 1.1V@(500mA) 35V 40uV 500mA 5V 66dB@(120Hz) Fixed Negative Short Circuit Protection、Thermal shutdown TO-220AB Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSonsemiVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SB140
DO-41-65℃~+125℃ 1 Independent 1A 30A 40V 500mV@1A 500uA@40V DO-41 Schottky Diodes ROHSonsemiSchottky Diodes
README
README.mdEnhanced Voltage Blaster
A (slightly) enhanced version of the original Voltage Blaster by PhilsComputerLab and Necroware here.
Enhancements:
- Diodes protect regulator from reverse polarity and reverse bias. Prevents soundcard-frying over voltage.
- Four LEDs show presence of the four main power rails on the ISA bus.
- Dual copper heatsink pads embedded into PCB design to keep regulator cool.
- Jumper to disable Voltage Blaster without removal. Can be used to verify lack of (-)5V on ISA bus.
The datasheet for the 79xx series negative regulators strongly recommend two protection diodes. PCs get shutdown suddenly and sound cards have lots of capacitance. The exact two situations described here.
Bill of Materials
| Item | Qty | MFG Part Num | Mouser Part Num |
|---|---|---|---|
| Neg 5V Linear Regulator | 1 | MC79M05CDT | 863-MC79M05CDT |
| 22uF 35V Electrolytic Capacitor | 2 | 860010572003 | 710-860010572003 |
| 5mm Red LED Diffused | 4 | WP7113ID | 604-WP7113ID |
| 330R Metal Film Resistor 1% | 2 | MFR-25FRF52-330R | 603-MFR-25FRF52-330R |
| 1K Metal Film Resistor 1% | 2 | MFR-25FRF52-1K | 603-MFR-25FRF52-1K |
| Schottky Diode 40 Volt 1.0 Amp | 2 | SB140-E3/73 | 625-SB140-E3/73 |
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R4 |
| 2 | 22uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C2 |
| 2 | 330R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R3 |
| 2 | SB140 | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D5, D6 |
| 1 | +12V | LED_THT:LED_D5.0mm | D2 |
| 1 | +5V | LED_THT:LED_D5.0mm | D1 |
| 1 | -12V | LED_THT:LED_D5.0mm | D4 |
| 1 | -5V | LED_THT:LED_D5.0mm | D3 |
| 1 | Bus_ISA_8bit_AB_Rev0 | ISA_Card_Edge_Connector_8bit:ISA_CARD_EDGE_CONNECTOR_8BIT_Rev1 | J1 |
| 1 | MC79M05 | Package_TO_SOT_SMD:TO-252-2 | U1 |
| 1 | OSHW-Logo2_7.3x6mm_SilkScreen | Symbol:OSHW-Logo2_7.3x6mm_SilkScreen | Open Hardware Logo |
| 1 | Output Disconnect | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
Questions
How big is the Voltage Blaster PCB?
It measures 85.3 × 29.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Voltage Blaster use?
16 parts, built around the MC79M05BT and SB140. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Voltage Blaster KiCad files?
From the chadr/Enhanced-Voltage-Blaster repository on GitHub, at the commit this page was made from: the board is KiCad/Voltage Blaster/Voltage Blaster.kicad_pcb and its schematic KiCad/Voltage Blaster/Voltage Blaster.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Voltage Blaster design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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